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31.
32.
Joanna Kisaa Ana M. Ferraria Nataliya Mitina Bogumi Cieniek Piotr Krzemiski Dariusz Pogocki Roman Nebesnyi Oleksandr Zaichenko Yaroslav Bobitski 《RSC advances》2022,12(35):22465
Molybdenum disulphide (MoS2) is a layered material with interesting photocatalytic properties. In this study, a layered MoS2 was produced using a hydrothermal method. The obtained material was characterised by XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), SEM (scanning electron microscopy), UV-Vis spectroscopy, DLS (dynamic light scattering), and zeta potential analysis. For the evaluation of the photocatalytic properties of layered MoS2, a solution of bromophenol blue (BPB) and the catalyst was illuminated for 120 minutes. According to the experimental results, MoS2 exhibited excellent catalytic activity in BPB degradation. The MoS2 preparation method enabled improved light harvesting, avoided fast charge recombination (related to bulk MoS2), and created a large number of suitable electron transfer sites for photocatalytic reactions. Simulation of BPB decay and bromide production was carried out for a further understanding of MoS2 photocatalytic action. The simulation results proved the reduction mechanism of BPB photodegradation.Molybdenum disulphide (MoS2) is a layered material with interesting photocatalytic properties. 相似文献
33.
R. G. Kozhedub V. A. Zosimovskii M. I. Zaichenko Yu. V. Raigorodskii N. G. Mikhailova 《Bulletin of experimental biology and medicine》1997,123(5):434-438
Firing activity of the same neurons and neuronal pairs in the hypothalamus and cerebral cortex is analyzed in rats during
four consecutive motivational/emotional states controlled at the behavioral level (states of motivation, removed motivation,
predominantly positive emotions, and predominantly negative emotions). Generalized characteristics of neuronal activity are
identified that reflect the four states.
Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 123, No. 5, pp. 501–505, May, 1997 相似文献
34.
Which McMaster egg counting technique is the most reliable? 总被引:1,自引:0,他引:1
Vadlejch J Petrtýl M Zaichenko I Cadková Z Jankovská I Langrová I Moravec M 《Parasitology research》2011,109(5):1387-1394
This study focuses on the comparison of three selected modifications of the McMaster counting technique, namely the McMaster
method modified by Wetzel (W) and Zajíček (Z), as well as the concentration McMaster technique according to Roepstorff and
Nansen (R&N). These modifications differ in the weights of faeces examined (W, 2 g/Z, 1 g/R&N, 4 g), flotation solutions (W,
NaCl/Z, MgSO4 + Na2S2O3/R&N, NaCl + glucose), centrifugation (W, none/Z, 2,000 RPM for 2 min and 2,000 RPM for 1 min/R&N, 1,200 RPM for 5 min), number
of McMaster chambers investigated (W, 3/Z, 2/R&N, 2), and multiplication factors used (W, 67/Z, 33/R&N, 20). To investigate
the sensitivity and reliability of these methods, nematode eggs (Teladorsagia circumcincta) were used. Parasite elements are distributed through negative binomial distribution in naturally infected host faeces, and
the number of parasite elements in a given amount of faeces sample is unknown to man. Therefore, we decided to prepare the
exact number of eggs which were added to the parasite negative faeces; the faecal sample was then investigated. From this
perspective, this is the first time a comparison of the McMaster methods has been so accurately investigated. This approach
allows us to evaluate the real sensitivity and reliability of the tested method. As the findings of this study indicate, the
highest sensitivity and reliability were obtained using the Roepstorff and Nansen modification. This McMaster modification
is able to detect 20 eggs per sample (in 70% of samples). Concentrations of 200 and 500 eggs can be found in almost 100% of
samples. Moreover, this method is simple, cheap and fast. For these reasons, we can recommend this method for routine veterinary
practice. 相似文献
35.
Halina I. Falfushynska Lesya L. Gnatyshyna Oksana B. Stoliar 《Ecotoxicology (London, England)》2013,22(3):433-445
The aim of the present study was the investigation of the effect of in situ exposure history on the responses of freshwater mussels to thiocarbamate fungicide. Male bivalve mollusks Anodonta anatina (Unionidae) from polluted (A) and unpolluted (F) sites were subjected to 14 days of exposure to fungicide Tattoo (mixture of propamocarb and mancozeb, 91 μg L?1). When unexposed mussels were compared, chronic effect of toxic environment in site A was confirmed by oxidative stress indices (high levels of superoxide dismutase and catalase activities, lipid peroxidation, protein carbonyls and oxyradical production, low level of total glutathione (GSH)), genotoxicity (high levels of DNA-strand breaks and caspase-3 activity in digestive gland), and cytotoxicity (low lysosomal membrane stability in hemocytes), elevated vitellogenin-like proteins (Vtg-LP) concentration in gonads, high levels of Cu, Zn, Cd, metallothionein (MT)-bound metals (MT-Me) and MT-related thiol (MT-SH), and low ethoxyresorufin-O-deethylase (EROD) activity in digestive gland. The major differences in the responses of the two exposed groups were related to antioxidant defense and MT: in the group A, prominent oxidative stress response with the participation of MT-SH and GSH in the gills, EROD activation, but decrease of MT-Me level was shown, whereas in group F exposure provoked the elevation of MT-Me, caspase-3 and Vtg-LP values. Carbamate did not cause cholinesterase depletion and cytotoxicity. However, genotoxic and pro-oxidant effects (increased levels of hemocytes with micronuclei and nuclear abnormalities, DNA-strand breaks and oxyradical in digestive gland), were common responses for both the exposed groups. 相似文献
36.
When we perceive speech, our goal is to extract the meaning of the verbal message which includes semantic processing. However, how deeply do we process speech in different situations? In two experiments, native Dutch participants heard spoken sentences describing simultaneously presented pictures. Sentences either correctly described the pictures or contained an anomalous final word (i.e. a semantically or phonologically incongruent word). In the first experiment, spoken sentences were task-irrelevant and both anomalous conditions elicited similar centro-parietal N400s that were larger in amplitude than the N400 for the correct condition. In the second experiment, we ensured that participants processed the same stimuli semantically. In an early time window, we found similar phonological mismatch negativities for both anomalous conditions compared to the correct condition. These negativities were followed by an N400 that was larger for semantic than phonological errors. Together, these data suggest that we process speech semantically, even if the speech is task-irrelevant. Once listeners allocate more cognitive resources to the processing of speech, we suggest that they make predictions for upcoming words, presumably by means of the production system and an internal monitoring loop, to facilitate lexical processing of the perceived speech. 相似文献
37.
Lesya V. Tumanovska R. James Swanson Zoya O. Serebrovska Georgii V. Portnichenko Sergii V. Goncharov Bohdan A. Kysilov Olexandr O. Moibenko Victor E. Dosenko 《Pathophysiology》2019,26(3-4):219-226
Many studies have been dedicated to hypertension and hypercholesterolemia, as they are the primary conditions that influence the unfolded protein response (UPR). However, the concurrent effects of these two factors are unknown. Our research used spontaneously hypertensive rats (SHR) fed a cholesterol enriched diet (CED) as model of atherosclerosis formation to discover what effect the simultaneous actions of hypertension and hypercholesterolemia have on the UPR. The combination of hypertension and consumption of a CED (not the CED alone) caused the formation of early atherosclerotic features. Both increased expression of the CCAAT-enhancer-binding protein (CHOP) and the insulin induced gene 1 (INSIG1), which is the target gene of the sterol regulatory element-binding protein 1-c (SREBP1-c), and decreased expression of the spliced x-box binding protein1 (sXBP1) mRNA were observed in the SHR fed a CED. Cholesterol overload strongly suppressed glucose regulated protein 78 (GRP78), glucose regulated protein 94 (GRP 94), and the expression of CHOP and INSIG1 mRNA in both normotensive and hypertensive rats. Unlike other UPR factors, the sXBP1 mRNA expression was strongly downregulated in SHR fed a normal diet but upregulated in those fed a CED. The changes to UPR in the SHR fed a CED were associated with improvement of the initially impaired heart function of the rats. 相似文献
38.
The behavior of rats was studied in conditions of having the “right” to select reinforcement on the basis of its value depending on the duration of the delay to its receipt. Rats were placed in a chamber fitted with two movable pedals, pressing on one of which yielded low-value food reinforcement (one pellet), while pressing the other led to delivery of a higher-value (four pellets) but delayed reinforcement. Rats preferring the low-value reinforcement without a delay were regarded as “impulsive,” while those preferring the higher-value reinforcement with the delay were regarded as “self-controlled.” The behavioral characteristics of the rats of these two groups were studied during execution of an operant pedal-pressing reaction, as were the effects of the duration of the reward delay and changes in the level of motivation to select the pedal to receive reinforcement. Preference for selecting the pedal to receive one reinforcement or the other was assessed and the durations of the latent periods of pedal-pressing and the numbers of omitted reactions were evaluated. “Impulsive” animals were found to press the pedal significantly more quickly and to omit fewer pedal presses than “self-controlled” animals. Increases in the delay duration to 7 sec led to refusal to select the pedal yielding the delayed reinforcement. Strengthening of food motivation pushed to rats’ behavior towards “self control,” while sated rats more frequently preferred the less valuable but rapidly delivered reinforcement. 相似文献
39.
40.